Swithen c



S. C. PBTTEGREW.

NUT LOGK.

No. 478,019. Patenvt'edJlme 28, 1892.

UNITED STATES PATENT OFFICE.

SWITHEN C. PETTEGREW', OF IBAYARD, KANSAS, ASSIGNOR OF ONE-HALF TO DRURYE. VANDEGRIFT, OF SAME PLACE.

NUT-LOCK.

SPECIFICATION forming part of Letters Patent No. 478,019, dated J' une28, 1892.

Application filed .Tune 1, 1891. Serial No. 394,781. (Model.)

To all whom t may concern: over the nut 2, so that should the nut 2 at-Be it known that I, SWITHEN C. PETTE- tempt to loosen or becomeunscrewed it will GREW, of Bayard, in the county of Allen andbeimpossible for it to do so, as in rotatingback- State of Kansas, haveinvented certain new ward it will come in contact with the projecanduseful Improvements in Nut-Locks, of tion 6 on the outer nut 4 and causethe same 55 which the following is a full, clear, and eX- to moveforward on its individual thread, act description, reference being hadto the thus securely locking the two nuts. The proaccompanying drawings,which form a part jection 6 is beveled, as shown at 7 ,8, so that ofthis specification. as the nut 2 attempts to unscrew, and in do- IoMyinvention relates to certain new and useing so forces the nut 4 towarditself, it will 6o ful improvements in nut-locks; and it conpermit thenut 4 to approach the nut 2. sists in certain features ofnoveltyhereinafter I claim as my inventiondescribed,and pointed out inthe claims. 1. The combination of the bolt l, a portieri Figure I is aperspective of my improved 3 of which is threaded in one direction, asI5 nut-lock. Fig. IIis an elevation showing the shown, an inner nutplaced on said portion, 65 nuts in section. Fig. III is a side elevationan outer portion 5 of less diameter than the of the outer nut. innerportion and having its thread running Referring to the drawings, lrepresents thev `-in the opposite direction fromthe inner porbolt towhich the nuts are secured. 2 repretion, a permanent outer nut placedthereon, 2o sents the inner nut, secured to the bolt l on and a lateraliXed extension 6, formed with 7o a right-handed threaded portion 3, thesaid and projecting permanently from said outer nut being rounded orbeveled off, as shown nut and adapted to project over the inner in Fig.2. nut when the outer nut has been screwed into et represents the outernut, preferably place, substantially as described, and for the formed ofspring-steel, said nut vbeing sepurpose set forth. f 7 5 cured to thebolt l on an extension 5 of said 2. The combination ofthe bolt 1, havinga bolt, said extension being of less diameter nut secured to aportion ofthe same,said porthan the portion to which the inner nut is setionhaving a thread running in one direccured and having a left-handedthread, or a tion, an outer portion 5, having a thread runthread runningin an opposite direction from ningin the opposite direction and being ofless So the thread to which the inner nut is secured. diameter than theinner portion, and nuts se- I have described the inner thread as beingcured to said portions, said outer nut having right-handed and the outerthread as lefta lateral fixed extension 6, the said extension handed,but do not confine myself to this having an under beveled face 7 andside bevspecific construction, as, if desired, the inner eled faces8,`substantially as and for the pur- 85 thread may be a left-handedthread and the pose set forth. outer thread a right-handed one. 8. Thecombination of the-bolt l, having a On the outer nut 4 is a lateralIiXed eXten- "portion threaded in one direction, an outer sion 6, whichwhen said nut has been screwed portion of less diameter than the innerporinto place extends over the inner nut 2, said tion, having its threadrunningin the opposite 9o extension 6 having its under surface beveled,direction, and nuts screwed onto the-threaded as shown at 7, and havingits sides beveled, portionsfthe inner nut beingrounded or bevas Shown atQ eled oi and the outer nut having an exten- In operation after the bolthas been placed sion 6, the said extension having an under in positionthe nut 2 is screwed thereon,said beveled face 7 and side beveled faces8, sub- 9 nut passing'over the extension 5, as it is of stantially asand for the purpose set forth.

smaller diameter than the thread of said nut, SWITI-IEN C. PETTEGREW.after which the nut 4 is screwed onto the ex- Vitnesses: tension 5. Vhenthe same is screwed up JAS. E. KNIGHT,

5o tight, the projection 6 will extend partially F. E. MULLETT.

